of Arbaciidae, [532];

of Echinothuriidae, [532], [535];

of Colobocentrotus, [532];

of Heterocentrotus, [532];

of Echinocardium cordatum, [550]

Primnoa, [354];

P. lepadifera, [338]

Primnoidae, [330], [335], [354]

Pringsheim, on exogamy in Pandorina, [34] n.

Prionastraea (Astraeidae, [399]), [375]